And Further Down the Mountain...Tap-sa

Continuing down the mountain we got to Tap-sa (Pagoda Temple). At Tap-sa there are about 80 stacks of rocks that were handmade by a hermit who used to live here. It is said that none of the rock pagodas have ever been blown down despite the wind. What I want to know is how the rocks were stacked in the craters in the side of the mountain...